Portion of a shoe sole



FIG. 1 is a side elevational view of a portion of a shoe sole showing my new design;

FIG. 2 is a frontal perspective view thereof;

FIG. 3 is a rear perspective view thereof; and,

FIG. 4 is a top plan view thereof.

The uneven broken line showing of the remainder of the shoe sole is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a portion of a shoe sole, as shown and described. 